Regenerative hot-blast stove



(No Model.) 2 Sheets-Sheet I.

G. W. MGG'LURE 8; O. AMSLER. REGENERATIVE HOTBLAST STOVE.

No. 469,820. 7 Patented Mar. 1,1892.

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GEORGE MOOLURE AND CARL AMSLER, OF PITTSBURG, PENNSYLVANIA.

REG EN ERATIVE HOT-BLAST STOVE.

SPECIFICATION forming part of Letters Patent No. 469,820, dated March 1,1892.

Application filed June 5, 1891. Serial No. 395,246. (No model.)

' To all whom it may concern.-

Be it known that we, GEORGE W. MOOLURE and CARL AMSLER, both ofPittsburg, in the county of Allegheny and State of Pennsylvania, haveinvented a new and useful Improvement in Regenerative Hot-Blast Stoves,of which the following is a full, clear, and exact description,reference being had to the achorizontal sectional view in four difierentsec' tion planesviz., on the planes shown by the lines A A, B B, C C,andD D,respectively. v

The object of ourinvention is to provide a stove having at the top aconnection between the vertical fiues and the stack-flue, so constructedthat there shall not be that liability to fracture of the'walls byexpansion and contraction which has been present in stoves constructedas heretofore. This we effect by constituting the connecting-passage bymeans of a dome-shell or arch made separate from the crown of the stoveand affording an intervening space instead of forming fines in the crownitself.

Our invention also relates to other features of construction of thestove.

Referring now to the drawings, 2 represents the outer cylindrical wallof the stove incased in a suitable jacket. The stove, as shown, isdivided into a series of concentric annular fines, though it should beunderstood that our invention, broadly stated, is not limited to thearrangement of such fiues, since the construction of the top of thestove is claimed by us independently. We intend also to claim thesefeatures in combination.

3 is the central flue of the stove, the base of which serves as thecombustion-chamber, while the upper part terminates below thestove-crown 4and communicates with an annular fine 5, formed by an outercylindrical wall 6, which extends from the crown to the stoves base.

7 is an outer flue constituted by the annular space intervening betweenthe walls 6 and 2. The flue 5 is divided into a number of parts byradial partition-walls 8, which serve to increase the heating-surface ofthe stove, and the flue 7 is also divided by an annular wall 9 andcross-partitions 10. The fines 5 and 7 are connected by ports 11 at thelower part of the stove. These ports 11 enter the middle of the fines,and in addition thereto there are other connecting-ports 11 at the sidesof the ports 11, which insure even flow of the gas to all parts of thefiue and prevent unequal distribution of the gas. All the radial wallsin the outer fine 7 terminate said fine.

12 is a gas-inlct port opening into the base of the flue 3.

13 is a gas-burner pipe adapted to discharge gas thereinto, and 1a is anair inlet port through which air is admitted to support combustion ofthe gas.

15 is the hot-blast main provided with a suitable valve 16 and leadingfrom the base of the flue 3. This main is also provided with an air-port17 for the inlet of air to assist in combustion of the gas.

18 is a dome or arch which surmounts the outer wall 2 and is separatefrom the crown of the stove, so as to afford an intermediate fine orpassage 22, connecting all the divisions of the outer flue 7 with acentral stackfiue 19 for the exit of the products of cornbustion.

20 isa valve for closing the stack-fiue,'and

21 is the cold-blast-inlet pipe, which discharges into the stack-finebelow said valve and is itself provided with a suitablecontrolling-valve by which the admission of air may be regulated.

21 21 are holes through which may be drawn chains attached to suitablebrushes or scrapers in the fines.

The operation of the stove is as follows: To heat the fines thestack-flue valve 20 is opened, the valve of the hot-blast main isclosed, and combustible gas is introduced into the gasinlet 12.- Thegas, uniting with air admitted through the air-inlets, burns in the flue3, ascends through this fiue to the crown of the stove, then descendsthrough the several divisions of the annular fiue 5, and at the basethereof passes through the ports 11 and 11 into the outer flue 7 andascends through the divisions of this fine, and finally passes throughthe flue 22 to the stack. When the fines have been heated in this mannerto a sufficiently high degree, as in ordinary hotblast stove practice,the gas and air inlets into the base of the fine 3 are closed, thestackvalve is also closed, and the valves of the cold-blast pipe andhot-blast main are opened. I

The air then enters through the cold-blast main, descends through theflue 22, and passes in succession (and in reverse direction to theabove-described course of the gases of combustion) through the dues 7,5, and 3, in which it is heated by the stored heat of the walls, andfinally passes off through the hot-blast main to the furnace, at whichit is utilized. When the stove has cooled to such extent that the air isno longer efficiently heated, it is again heated by reversal of thevalves in the usual way.

It will be noticed from the foregoing description that the arch 18,being not tied to the-inner crown of the stove, is quite free to movevertically with the outer walls in the expansion and contraction causedby variations in temperature of the stove. way we overcome what has beena fruitful structure. from having the flue 22 continuous, or practicallyso, instead of employing a series of small individual fines traversingthe furnacecrown, is that we secure an even draft from all the divisionsof the upright fines and thus passages leading into the inner shell, and

valved passages leading from the space be- In this tween the roof andcrown, substantially as and for the purposes described.

. 2. A hot-blast stove comprising an outer roofed shell, an innerconcentric shell with a crown separated from the outer roof and havingapertures in its sides, an open-topped shell within the inner crownedshell, valved passages leading into the innermost shell, and valvedpassages leading from the space between the roof and crown,substantially as and for the purposes described.

3. A hot-blast stove comprising an outer roofed shell, an inner shellhaving a crown, a series of apertures in the lower part of the innershell, a higher series of apertures alternating therewith, valvedpassages leading into the inner shell, and valved passages leading fromthe space bctweenthe roofand crown, substantially as and for thepurposes described.

4. A hot-blast stove comprising an outer roofed shell, an inneraperturcd shell having a crown separated from the outer roof, partitionsin the flue between the shells and terminating above the apertures,valved passages leading into the inner shell, and valved passagesleading from the space between the roof and'crown, substantially as andfor the purposes described.

5. A hot-blast stove comprising an outer roofed shell, a valvedstackaflue leading therefrom,-an inner concentric shell having aseparatecrown, apertures inthe wall of the inner shell, a combustion-chamberwithin the inner shell, a hot-blast o'utlet an inlet for fuel loadingthereto, and a cold blast outlet terminating in the space between thecrown and roof, substantially as and for the purposes de scribed.

In testimony whereof we have hereunto set our hands this 29th day ofMay, A. D. 1891.

GEORGE W. MGCLURE. CARL AMSLER. Witnesses:

H. M. CORWIN, THOMAS W. BAKEWELL.

